American Nuclear Society

Home / Publications / Journals / Nuclear Science and Engineering / Volume 151 / Number 2

Multiple Timescale Expansions for Neutron Kinetics - I: Illustrative Application to the Point-Kinetics Model

B. R. Merk, D. G. Cacuci

Nuclear Science and Engineering / Volume 151 / Number 2 / October 2005 / Pages 184-193

Technical Paper /

The derivation of a closed-form expression is presented for a three-timescale approximation of the point-kinetics equations with two effective groups of delayed neutrons. The results produced by this three-scale approximation are shown to be practically as accurate as the numerical results produced by the Kaganove-type algorithms used in production codes, yet at significantly less cost in computational time and resources. Potential uses of this approximation for increasing the efficiency of production codes for computing the space-time distribution of neutrons in reactors are also indicated.

Questions or comments about the site? Contact the ANS Webmaster.